The composite aluminum 2014-T6 bar is made from two segments having diameters of \(7.5 \mathrm{~mm}\) and \(15 \mathrm{~mm}\). Determine the maximum height \(h\) from which the 10-kg collar should be dropped from rest so that it produces a maximum axial stress in the bar of \(\sigma_{\max }=300 \mathrm{MPa}\).

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7.5 mm- 300 mm. 15 mm 200 mm